Rise of high-speed automatic doors according to the changes of the times
The role of the door in various fields is gradually changing, and security was an important purpose at first, but now its area has been expanded to various requirements such as internal and external isolation, pollution prevention, environment creation, and design. In the case of large openings such as vehicles, equipment, and forklifts, as well as openings for people to pass through, there were few options other than shutters. However, with the development of technology, high-speed automatic doors are now widely used in industrial and commercial applications.
The reason is that
1. Fast opening and closing speed
2. Automatic opening and closing using sensors
3. Linkage with various equipment (industrial automation)
etc.
In this period of entering the era of the 4th industry, the automation of these doors is also a field that should be basically required into machine automation.
What is a high-speed automatic door?
Unlike conventional shutter doors and garage doors, this is an automatic door that can be opened and closed quickly. In general, it operates at a speed of 2m/s, and it is a system that automatically opens and closes automatically when a vehicle or person enters and exits with a sensor. In addition, the fact that there is a controller allows for interlocking and interlocking between various industrial equipment is one of the advantages.
The requirements for these high-speed automatic doors are as follows.
1. Rapid opening/closing speed (1~2m/s)
2. Automation (interlocking with sensors, switches, and other equipment)
3. Strong durability
4. Strong chemical properties
5. High reliability
Type of High-speed door?
Door leaf Material
In general, lightweight yet durable materials should be used to operate quickly. For this reason, it is not suitable for manufacturing with iron, and it can be manufactured using PVC tarpaulin, aluminum alloy, etc. However, the current trend of high-speed automatic doors is the high-speed automatic doors made of PVC Tarpaulin.
PVC
- PVC is the most widely used material for its chemical resistance, flexibility, and light weight.
- PVC is waterproof, fireproof, and UV coated, so it can be used for various environments.
- Since the connection method is made of PVC welding, various colors, designs, and transparent windows can be added easily.
- Some insulation can be provided by foam filling between PVC.
- Each manufacturer has a similar connection type for compatibility.
- Generally, PVC tarpaulin with a thickness of 0.8mm to 1.5mm is used, and in special cases, 2mm is used.
- It is used in roll-up or folding up type.
Aluminum alloy
- In the case of aluminum alloy, the price is much higher than that of PVC, but it has a beautiful appearance and can provide security at the level of a shutter door.
- In addition, it is possible to provide a high level of insulation through PU filling between panels thicker than PVC.
- Aluminum alloy has the disadvantage of increasing mechanical complexity and maintenance cost because it is difficult to have a roll-up structure like PVC.
- Each manufacturer has a different type of slat, and the connection method is also different. (Compatibility is difficult.)
- It is mainly used in spiral type.
Structure of High speed doors
The types below list most of the types currently on the market. There are different methods, each with their pros and cons, so check them out below.
Roll up
- The roll-up type is the most common type and consists of PVC rolled up through a central shaft connected to the motor. It can be applied even when the door surface is aluminum.
- In the most efficient way, it is easy to maintain and relatively inexpensive.
- This method is mainly used for small and medium size (under 5M*5M), and there are cases where there is no aluminum reinforcing bar when installed indoors.
Folding up
- The folding method is mainly applied to large-size doors, and it is a method to open the door by pulling up the lowermost part using a belt or wire so that the PVC is folded. This method is applied mostly when the door leaf is PVC.
- This method is mainly applied to large doors, and it has very strong against wind.
- It depends on the structure, but it can be applied to mega doors up to 40M*40M.
- This type is suitable for places that require large doors such as ports, aviation, and heavy equipment.
Spiral
- This is a method in which the door is stored in a spiral shape as there are spiral-shaped rails on both sides of the storage part of the door.
- Since the door surfaces do not collide with each other, the noise is low.
- The size of the door storage is larger than the roll-up method.
- Both PVC and aluminum alloys are applicable, for PVC a tooth is required, and for aluminum a roller and chain are required.
Self-repairing
- This method has a function that restores to its original position when the door is opened and closed after impact on the door.
- No reinforcing bar.
- Mainly, it is possible only when the door surface is PVC, and in the case of the shape, all three methods above are possible.
- Mainly in the middle of the rail, there is a recovery system that puts the door back into the rail if it derailed the rail, so automatic recovery is possible.
- Each time it is removed, the restoration parts are damaged, so parts exchange is required for long-term use.
structure material
As the parts that make up the exterior and frame of the door, steel is generally used as a basis, and there are differences by manufacturer/product in the field, such as aluminum alloy and stainless steel.
sensor
The advantage of high-speed automatic door is automatic opening through sensor. The most used sensors are:
Infrared & Motion sensor
This sensor usually detects an object that is installed on the top of the door and opens the door. Although the price is relatively expensive, various setting options such as cross-traffic detection and object size detection are available. However, there is a small possibility of malfunction depending on the weather or environment outside.
Induction loop (Metal detector sensor)
A cable embedded in the floor detects a nearby metal object and opens the door. It is mainly used for the entrance and exit of vehicles and bogies, and since it is buried in the floor, it does not be affected the outside weather or environment.
ETC
Depending on the site, if it is not suitable for both environments, there are various sensors suitable for it, and any sensor can be connected to a controller to configure an operable system.
safety sensor
Because the door operates at a very high speed, a safety sensor is essential to prevent accidents when the door is opened or closed. The door controller closes the door after a certain delay time (settable) after opening. When an object is detected by the safety sensor, this interval is initialized, and the controller start from 0 seconds again. If it is detected while the door is being closed, the door will be stopped or reopened (settable). Commonly used safety sensors are as follows.
photo beam sensor
It detects whether there is an object passing under the door through a single beam divided into a light-receiving unit and a light emitting unit. In general, it is installed at a position about the knee, and for objects that do not change in height, such as vehicles and people, it is installed.
light curtain sensor
It is like a photo beam, but this sensor maximizes the detection range by emitting about 8 to 14 beams at the same time. If even one beam is detected, the safety sensor is detected. It is useful if the height of the incoming object is different every time. Also, in the case of this sensor, both the detection range and the interval should be checked at the same time. OZ generally uses a sensor that can detect at least 80mm objects with a detection range of 1240m.
edge sensor
It is usually installed at the bottom of the door and the safety sensor is detected when it meets this sensor. Unlike the above two, it is a contact method, but generally there is a rubber sealing at the bottom, so the impact is not great. It is installed to ensure safety by applying the above two methods at the same time.
drive system
In the case of a high-speed automatic door motor, unlike a normal shutter door, it has to generate strong power and high speed at the same time. Therefore, motors for industrial equipment are mainly used, and various motors are mainly used from 0.75kw to 5KW.
In addition, since precise control is required, a controller is required, and the controller mainly includes soft start/stop functions, interlocking with various equipment, safety control, and various interlock functions.
Manual open
Although it varies by manufacturer, in general, the door can be opened by manually turning the motor through the hole under the motor.
Ending…
High-speed automatic doors, which are frequently used in industrial and commercial applications, are a field that is expected to have tremendous use in the future. OZ Door is continuously improving its products according to this and has the capacity to produce products according to the various needs of customers. If you have any needs, please feel free to contact us. thank you.
